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US 6,273,189 B1Granted
Downhole tractor
AssigneeHalliburton Energy Services, Inc.
InventorsRobert W. Gissler, Michael W. Holcombe, Daniel Purkis
Life of this patent
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AssigneeHalliburton Energy Services, Inc.
InventorsRobert W. Gissler, Michael W. Holcombe, Daniel Purkis
Estimating the term…
A downhole tractor is provided that includes a housing and a first wheel assembly coupled to the housing that is operable to translate away from the housing in a first direction. The first wheel assembly has a first electric motor, a first wheel, and a first reduction gear assembly coupled between the first electric motor and the first wheel. A second wheel assembly is coupled to the housing and is operable to translate away from the housing in a second direction that is opposite to the first direction. The second wheel assembly has a second electric motor, a second wheel, and a second reduction gear assembly coupled between the second electric motor and the second wheel. A fluid ram is coupled to the first and second wheel assemblies for selectively translating the first and second wheel assemblies toward and away from the housing. A first controller is provided for controlling the flow of current to the first and second electric motors. On-board and surface control systems may be incorporated to permit selective active of the wheels assemblies. In addition, couplings and connectors employing shape-memory materials may be included to secure the tractor to coiled tubing or a wireline.
A downhole tractor, comprising:
A wheel assembly for a downhole tractor, comprising:
A downhole tractor, comprising:
A downhole tractor, comprising:
A downhole tractor, comprising:
A wheel assembly for a downhole tractor, comprising:
A wheel assembly for a downhole tractor, comprising:
Dependencies are inferred from the claim text.